The Vertical Lines Texture Roller is precision carved and uniquely designed. Simply roll the Twig roller with your hand or roller board across a slab of clay. On a thrown pot roll the twig roller up the outside wall to create a beautiful pattern. MKM wood rollers are bevel carved allowing the clay to release easily. The TW texture roller is designed to be used with natural, polymer, and precious metal clays. MKM rollers are finished with oil to ensure durability over many years of use. If clay does get stuck in the roller gently brush it out with a soft toothbrush and warm water.